Modulator-Chip Based on Semiconductor Heterostructures with a Surface Diffraction Grating for Laser Beam Steering

2021 ◽  
Author(s):  
Vasiliy Zolotarev ◽  
Sergey Slipchenko ◽  
Ilya Shashkin ◽  
Alena Kazakova ◽  
Vladislav Kriuchkov ◽  
...  
Keyword(s):  
Laser Beam ◽  
Diffraction Grating ◽  
Beam Steering ◽  
Semiconductor Heterostructures ◽  
Surface Diffraction

Fan-beam steering device using a photonic crystal slow-light waveguide with surface diffraction grating

2017 ◽  
Vol 42 (23) ◽  
pp. 4990 ◽  
Author(s):  
Keisuke Kondo ◽  
Tomoki Tatebe ◽  
Shoji Hachuda ◽  
Hiroshi Abe ◽  
Fumio Koyama ◽  
...  
Keyword(s):  
Photonic Crystal ◽  
Diffraction Grating ◽  
Slow Light ◽  
Beam Steering ◽  
Light Waveguide ◽  
Surface Diffraction

Control of a Flexible Continuum Manipulator for Laser Beam Steering

2021 ◽  
Vol 6 (2) ◽  
pp. 1074-1081
Author(s):  
Hangjie Mo ◽  
Ruofeng Wei ◽  
Bo Ouyang ◽  
Liuxi Xing ◽  
Yanhu Shan ◽  
...  
Keyword(s):  
Laser Beam ◽  
Beam Steering ◽  
Continuum Manipulator

Laser Beam Steering Along Three-Dimensional Paths

2018 ◽  
Vol 23 (3) ◽  
pp. 1148-1158 ◽  
Author(s):  
Brahim Tamadazte ◽  
Rupert Renevier ◽  
Jean-Antoine Seon ◽  
Andrey V. Kudryavtsev ◽  
Nicolas Andreff
Keyword(s):  
Laser Beam ◽  
Beam Steering ◽  
Three Dimensional

Optical GNSS Receiver for the ESA's NGGM-MAGIC Mission and for LEO Satellites with the Highest Orbit Accuracy

2021 ◽  
Author(s):  
Drazen Svehla
Keyword(s):  
Laser Beam ◽  
Gravity Field ◽  
Carrier Phase ◽  
Beam Steering ◽  
Precise Orbit Determination ◽  
Optical Carrier ◽  
Gnss Receiver ◽  
Cw Laser ◽  
Leo Satellites ◽  
Leo Satellite

<p>Precise orbit determination (POD) of LEO satellites is done with a geodetic grade GPS receiver measuring carrier-phase between a LEO and GPS satellites, and in some cases this is supported with a DORIS instrument measuring Doppler between LEO and ground DORIS stations. Over the last 20 years we have demonstrated 1-2 cm accurate LEO POD and about 1 mm for inter-satellite distance. In order to increase the accuracy of the single satellite POD or satellites in LEO formation we propose an “optical GNSS receiver”, a cw-laser on a LEO satellite to measure Doppler between a LEO and GNSS satellite(s) equipped with SLR arrays and to develop it for the next gravity field mission.      </p><p>The objective of the ESA mission NGGM-MAGIC (Next Generation Gravity Mission - Mass-change and Geosciences International Constellation) is the long-term monitoring of the temporal variations of Earth’s gravity field at high resolution in time (3 days) and space (100 km), complementing the GRACE-FO mission from NASA at 45° orbit inclination. Currently, the GRACE-type mission design is based on optical carrier-phase measurements between two LEO satellites flying in a formation and separated by 200 km.</p><p>We propose an extension of the GRACE-type LEO-LEO concept by the “optical GNSS receiver” to provide Doppler measurements between a LEO satellite and GNSS satellite(s) equipped with SLR corner cubes by means of a cw-laser onboard a LEO satellite. Such a “vertical” LEO-GNSS observable is missing in the classical GRACE-type LEO-LEO concept. If Doppler measurements are carried out from the two GRACE-type satellites in the LEO orbit to the same GNSS satellite and by forming single-differences to that GNSS satellite one can remove any GNSS-orbit related error in the measured LEO-GNSS Doppler. In this way, radial orbit difference can be obtained between the two GRACE-type satellites (free of all GNSS orbit errors) and complement “horizontal” LEO-LEO measurements between the two GRACE-type satellites in the LEO orbit.</p><p>The non-mechanical laser beam steering has been developed for an angle window of -40° to +40° and it does not require a rotating and a big telescope in LEO (no clouds and atmosphere turbulences in LEO). Therefore, in such a beam-steering window, one could always observe with a fiber cw-laser one GNSS satellite close to the zenith from both GRACE-type satellites. The non-mechanical beam steering concept in zenith direction can be supported by a small 10-cm like (fixed) Ritchey-Chrétien telescope (COTS), a Cassegrain reflector design widely used for LEO satellites, e.g., for James Webb Space Telescope or for an optical Earth imaging with Cubesats with the 50 cm resolution.</p><p>Considering that several GNSS satellites in the field of view could be observed from a LEO satellite with this approach (including LAGEOS-1/2 and Etalon satellites) and the non-mechanical laser beam steering could be extended towards the LEO horizon, an “optical” GNSS receiver is a new concept for POD of LEO satellites. Here, we provide simulations of this new concept for LEO POD with GNSS/SLR constellations equipped with SLR arrays and discuss all new applications this new concept could bring.</p>

scholarly journals Terahertz Beam Steering Concept Based on a MEMS-Reconfigurable Reflection Grating

Sensors ◽  
2020 ◽  
Vol 20 (10) ◽  
pp. 2874
Author(s):  
Xuan Liu ◽  
Lisa Samfaß ◽  
Kevin Kolpatzeck ◽  
Lars Häring ◽  
Jan C. Balzer ◽  
...  
Keyword(s):  
Diffraction Grating ◽  
High Speed ◽  
Beam Steering ◽  
Vertical Displacement ◽  
Grating Period ◽  
Terahertz Waves ◽  
Large Area ◽  
Electrostatic Actuators ◽  
Reflection Gratings ◽  
Reflection Grating

With an increasing number of applications of terahertz systems in industrial fields and communications, terahertz beamforming and beam steering techniques are required for high-speed, large-area scanning. As a promising means for beam steering, micro-electro-mechanical system (MEMS)-based reflection gratings have been successfully implemented for terahertz beam control. So far, the diffraction grating efficiency is relatively low due to the limited vertical displacement range of the reflectors. In this paper, we propose a design for a reconfigurable MEMS-based reflection grating consisting of multiple subwavelength reflectors which are driven by 5-bit, high-throw electrostatic actuators. We vary the number of the reflectors per grating period and configure the throw of individual reflectors so that the reflection grating is shaped as a blazed grating to steer the terahertz beam with maximum diffraction grating efficiency. Furthermore, we provide a mathematical model for calculating the radiation pattern of the terahertz wave reflected by general reflection gratings consisting of subwavelength reflectors. The calculated and simulated radiation patterns of the designed grating show that we can steer the angle of the terahertz waves in a range of up to ± 56.4 ∘ with a maximum sidelobe level of −10 dB at frequencies from 0.3 THz to 1 THz.

Ultra-Compact Laser Beam Steering Device Using Holographically Formed Two Dimensional Photonic Crystal

2010 ◽  
Vol 10 (3) ◽  
pp. 1650-1655
Author(s):  
Xinyuan Dou ◽  
Xiaonan Chen ◽  
Maggie Yihong Chen ◽  
Alan Xiaolong Wang ◽  
Wei Jiang ◽  
...  
Keyword(s):  
Photonic Crystal ◽  
Laser Beam ◽  
Beam Steering ◽  
Two Dimensional ◽  
Dimensional Photonic Crystal ◽  
Two Dimensional Photonic Crystal

Monolithic QW laser beam steering and wavelength tunability

2013 ◽  
Vol 46 (2) ◽  
pp. 331-336 ◽  
Author(s):  
Abdullah J. Zakariya ◽  
Patrick LiKamWa
Keyword(s):  
Laser Beam ◽  
Beam Steering ◽  
Wavelength Tunability
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